.city_list{
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.city_list_top{
    width: 100%;
    height: 50px;
    background: #ccc;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    &:first-child{
        font-size: 20px;
    }
}
.city_list_content{
    flex: 1;
    padding: 0 20px;
    overflow-y: auto;
    li{
        font-size: 18px;
    }
}